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The annual Geneva Motor Show is relatively unique among the world’s top auto shows in that every year, dozens of amazing and outrageous boutique vehicles from around the world flock to Switzerland to vie for the world’s attention. The 2009 show was no different, with tuned vehicles of all shapes, sizes and horsepower measurements scattered about the show floor.

But only a select few are part of a special club. The barrier to entry: 600 horsepower. Some are the cars that dreams are made of, others not so much, but all are special in their own right. Some have been at Geneva before; others are making their debuts here. All of them offer hope that extreme automotive enthusiasm in all its forms will continue to thrive. So without further ado, here are some of the Geneva show’s 600-hp stars. Welcome to the club…

Take one look at a Pagani and a singular word immediately springs to mind: fast. These outrageous, Italian made, carbon-fiber clad supercars both feature Mercedes-BenzAMG sourced V-12 power and lightweight construction that helps propel them to amazingly low acceleration times. But the Zonda R and Cinque do most of their talking at the track, which is clearly where they both belong.

The Swedish speed merchants at Koenigsegg have been parading their CCX around the auto show circuit since 2006 at Geneva, but this latest example in red is just as impressive as the first time we laid eyes on it back then. Even more impressive is the 806 horsepower derived from its 4.7L twin-supercharged V-8. Only 14 CCXs were scheduled to be built, making it one of the most exclusive cars in this group.

Italian boutique automaker Fornasari came in just over the 600-hp limit with its Fornasari Gruppo B, which is powered by a version of Chevy‘s LS2 6.0L V-8 engine. Weighing in at some 3306 lbs, the Gruppo B can reportedly hit a top speed of 174 mph and features all-wheel drive. Unfortunately, despite the impressive numbers, this car was flogged by an ugly stick.

Weighing in at only 2640 lbs, the Gumpert Apollo Speed is the range-topping machine of the Gumpert lineup. Made out of lightweight composites and aluminum, the Apollo Speed can reportedly hit a claimed top speed of over 224 mph (gear and power dependant). If that’s not impressive enough, Gumpert says it can accelerate to 62 mph in 3 sec flat and arrive at 124 mph in only 8.9 sec. Power is improved largely by a reengineered less restrictive induction system that feeds the giant snails bolted on to the Audi-soureced 4.2L V-8.

Noted Mercedes-Benz tuner Carlsson has taken the S65 AMG and made it even faster, tuning the 6.0L V-12 in the super S-Class to more than 700 horsepower and a staggering 811 lb-ft of torque. Top speed of this super sedan is reportedly 199 mph, and you’ll get there in style thanks to several exterior enhancements including 21-in. wheels and numerous interior upgrades designed to take the already luxurious Benz sedan to another level of swank. And owners can impress their friends when asked what the car is called (try saying it fast three times).

If the ultra-exclusivity of the Bugatti Veyron 16.4 just isn’t enough, Mansory offers the LINEA Vincerò, a new individualization program for the automotive marvel. It includes a reshaped and carbon-fiber-wrapped exterior, with LED daytime running lights and forged wheels. The interior feature ambient LED lighting as well, illuminating the seats, door linings and dashboard. The bucket seats sport an embroidered Vincerò logo. Revised intake and exhaust systems raise the already-stout output to 1109 hp and 966 lb-ft of torque. It’s safe to assume the Veyron’s 253 mph top speed is in jeopardy. The LINEA Vincerò package is available in limited numbers to Mansory ´s Middle East partner, Prestige Cars Abu Dhabi. Where else?